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However, compact fluros or a fluorex would probably be the only way to get enough light, and keeping such a small terrarium cool with these lights overhead may be an issue.
There are several methods of cooling a terrarium (read prior posts) but they're probably not practical for a tiny terrarium.

Oh.....and I have been growing brocchinia and heliamphora heterodoxa x minor under more lowland conditions (80-85F day, 70F night). The brocchinia are almost 20" tall and I'm concerned it might outgrow the terrarium!

I'm not sure if it would be appropriate for such a small enclosure, but you could use a humidifier to cool it. Temps go down as humidity goes up, so sticking an ultrasonic humidifier in there would definitely cool things. I think I've read reports of a difference of ten degrees or more from the ambient air temperature using this method.
~Joe

I have 46W on mine. 30's on the low side, but you can probably get away with it if you grow CPs that like medium light....but highland neps? Hmmm....you might have a hard time getting them to grow nice pitchers if the light's too low.